Key-set-key -responsive calculating



NOV. .24, 1953 w, HOPKlNs ETAL 2,660,374

KEY-SET-KEY-RESPONSIVE CALCULATING MACHINE Filed July 30, 1948 6Sheets-Sheet 1 H o h m In M colnvmm FIEUE U lNVENTORJ Gram W. HoPxm/ BYDONALD L. Rom

NOV. 24, 1953 w, HQPKINS ETAL 2,660,374

KEYSET*KEY-RESPONSIVE CALCULATING MACHINE Filed July 30, 1948 6Sheets-Sheet 2 INVENTORS Geom W. Hemu/ 2 BY 'DoNAw LRoLPn 4, 9 G. w.HOPKINS ET AL 2,660,374

KEY-SET-KEY-RESPONSIVE CALCULATING MACHINE Filed July 30, 1948 6Sheets-Sheet 3 7 FIE [IE3 E] 2 33 o F mmvroxs :3 3 E S GEORGE W. Homw 2gg BY Donna LRom Nov. 24, 1953 G. w. HOPKINS ET ALKEY-SET-KEY-RESPONSIVE CALCULATING MACHINE 6 Sheets-Sheet 4 Filed July50, 1948 mm mcwhumn \DON NOON Cm an" \FTN Fm MYN 2 2a 2a 1 3. 5; H O n7- mu 0 I of N V- 2 1953 G. w. HOPKINS ET AL ,660,374

- KEY-SET-KEY-RESPONSIVE CALCULATING MACHINE Filed July so, 1948 s SheetsSheet 5 IN V EN TORS GEORGE-W. m1 BY DONALD L. n

Nov. 24, 1953 G. w. HOPKINS ET AL 2,660,374

KEY-SETKEYRESPONSIVE CALCULATING MACHINE Filed July 50, 1948 6Sheets-Sheet 6 INVENTORS 5 9 GEORGE W. HOPMN/ BY DONALD LROLPH PatentedNov. 24, 1953 KEY-SET-KEY-KESPONSIVE CALCULATING MACHINE George W.Hopkins and Donald L. Rolph, San Leandro, Calif., assignors to FridenCalculating Machine 00., 1110., a corporation of California ApplicationJuly 30, 1948, Serial No. 41,526

20 Claims.

1 This invention relates to the registration control and cycleinitiating mechanism of a calculating machine and more particularly to alive keyboard or key-responsive type of machine in which theabove-mentioned mechanism is placed under the control of the amount keysso as to cause a registering operation to be initiated when an amountkey is depressed.

The present invention is shown as applied to a calculating machine ofthe type shown in U. S. Patent No. 2,229,889 issued January 28, 1941 toCarl M. F. Friden and reference may be had to this patent for a generalunderstanding of the construction and mode of operation of the basicmachine illustrated herein. It will be noted that the machine shown inPatent No. 2,229,889 is a key-set type of calculator in which the amountto be registered is first set-up on the keyboard after which the plusbar, minus bar, or other control key is depressed in order to initiateoperation of the actuating mechanism of the machine. When performingcertain types of calculations, however, for example, when adding up along list of figures, it may be found desirable to dispense with thenecessity of depressing the plus bar in order to initiate cycling of themachine and to place this function under the control of the amount keys.In other words, it may facilitate the work of the operator if themachine is capable of being converted into a key-responsive type ofcalculator in which the depression of an amount key serves not only toset a value into the machine but also serves to initiate an amountregistering operation.

Accordingly, it is an object of the present invention to provide acalculating machine which can be rendered either key-set orkey-responsive at the option of the operator.

It is another object of the invention to provide acalculating machinewhich can be selectively converted from a conventional multi-cyclic,keyset type of calculator into a unicyclic, key-responsive type ofmachine in which. additive registration operations are placed under thecontrol of the amount keyboard.

It is a further object of the invention to provide a calculating machinein which the means for initiating a registration operation may be placedunder the control of the units order keys of the amount keyboard. Inthis way the operator can set-up a figure on the keyboard beginning withthe highest order digit first and then proceeding through to the unitsorder digit whereupon the machine cycle will be initiated and the amountentered into the accumulator. Thus the need for depressing" the plus barafter the amount been set up on the keyboard is eliminated.

Still a further object of the invention resides in the provision ofmeans for rendering the ordirial clear keys live as well as the unitsorder keys so that when an amount ending in one or more zeros is set upon the keyboard, the depression of any one of the ordinal clear keyswill cause an adding operation to take place.

Another object of the invention resides in the provision of means forlimiting the operation of the machine to a sigle cycle when it isconditioned for key-responsive operatiom still another object of theinvention is to provide means for automatically causing the amount keysto be released at the end of each cycle when the machine is conditionedfor key-responsive operation.

it is a further object of the invention to provide a key-responsivecalculator in which the depression of a live key on the amount keyboardcauses the add-subtract registration control mechanism and the cycle:initiating means to be operated in a predetermined sequence.

Various other objects will become apparent from the followingdescription of a preferred embodiment of the invention, as illustratedin the accompanying drawings, in which:

Fig. 1 is a plan view of the complete machine showing the generalarrangement of the amount keys, multiplier keys, the various operationcontrol keys, and the shiftable numeral wheel carriage'.

Fig. 21 is a longitudinal sectional elevation showing the actuatingmechanism and thenumeralwheel carriage of the machine. This section istaken along the lines 2 2 in Fig. 1.

Fig. 3 is a longitudinal sectional elevation taken along the line 3-4 inFig. l and shows the unitsorder blank of amount keys together with:certain of the novel mechanism forming a part of this invention.

Fig. 4 is a fragmentary elevation showing in Fig. 7 is a fragmentaryview showing the keyset-key-responsive control slide.

Fig. 8 is a longitudinal sectional elevation showing the manner in whichthe gate setting slide and the cycle initiating slide are sequentiallyoperated by the auxiliary power actuator. This view is taken along theline 88 in Fig. 1.

Fig. 9 is a longitudinal sectional elevation taken along the line 9-9 inFig. 1 and showing additional details of the Add key and of the cycleinitiating mechanism.

Reference is made to application Serial No. 698,314 filed by George W.Hopkins on September 20, 1946, now Patent 2,552,789, issued May 15,1951, which contains claims to certain of the subject matter shown anddescribed but not claimed herein.

General description As previously stated, the present invention is shownincorporated in a machine of the type shown and described in U. S.Patent No. 2,229,889. It will become evident, however, from a study ofthe present disclosure, that the invention is not limited to use withmachines of this type but may also be applied to other types ofcomputing devices with equally desirable results.

In order to provide a clear understanding of the relationship of thepresent invention to the structure shown in the above-mentioned patent,a brief description will be given of certain of the mechanisms shown anddescribed in the patent. Referring to Figs. 1 and 2 of the drawings, themachine is comprised of a main body portion in which the actuating,selecting and control mechanisms are mounted, and a carriage 2| which ismounted for endwise shifting movement transversely of the body portion20 and which carries numeral wheels 22 and 23 of the accumulator andrevolutions counter respectively. The ends of the dial shafts upon whichthe accumulator wheels 22 are mounted are provided with twirler knobs 24by means of which the dials may be manually set to any desired positionfrom 0 to 9. The carriage 21 may be shifted in either direction by powerderived from the electric drivingmotor of the machine by manipulation ofthe carriage shift keys 25 and 25. Clearance of the accumulator wheels22 may be effected by manipulation of the resetting knob 21 while therevolutions counter wheels 23 may be reset to zero by manipulation ofthe knob 28.

Amounts to be entered into the accumulator wheels 22 may be set up onthe amount keys 28,

after which the amount may be entered positively i or negatively intothe accumulator wheels 22 by manipulation of the plus key or the minuskey 3|. In case an erroneous setting is made on the amount keys 29, theincorrectly depressed key in any one of the individual key banks may bereleased by depression of the ordinal clear key 32 relating to thatparticular bank. If it is desired to release all of the depressed keysof the keyboard, this may be accomplished by depression of the clear key33. Since it is ordinarily desirable in adding and subtractingoperations to cause all depressed amount keys to be released at the endof each machine cycle, an Add key 34 is provided which may be depressedand latched down in order to cause the auto matic release of all amountkeys at the conclusion of each machine cycle. A keyboard lock lever 35is also provided for locking all of the amount keys 29 in either theirnormal or depressed positions so as to preserve the value set 4 thereinfor succeeding calculations to be performed on the machine.

The machine is also provided with a return clear key 36 for causing theshiitable carriage to be traversed to its extreme left hand positionafter which the accumulator wheels 22, or revolutions counter wheels 23,or both, depending upon the angular setting of the knobs 21 and 28, willbe reset to their "0 positions thereby preparing the machine for thenext operation to follow. A complete disclosure of this mechanism willbe found in Patent No. 2,294,083 issued to Carl M. Friden on August 25,1942.

Dividingoperations are performed on this machine by entering thedividend on the accumulator wheels 22, setting the divisor into theamount keys 29, and then pulling forward and releasing the divisionlever 31. This will cause an automatic division operation to take placein which the divisor is repeatedly subtracted from the dividend until anoverdraft occurs in the accumulator wheels 22, after which the divisoris added back into the accumulator so as to eliminate the overdraft andthe carriage shifted one order to the left. The divisor is againrepeatedly subtracted from the dividend in this order until an overdraftoccurs, whereupon the divisor is added back into the accumulator wheels,the carriage shifted, and so on, from order to order until a quotientcontaining the desired number of decimal places is obtained in therevolutions counter wheels For a complete disclosure of the automaticdivision mechanism, see Patent No. 2,327,981 issued August 31, 1943, toCarl M. Friden.

To the left of the amount keyboard is provided a group of ten multiplierkeys 38 by means of which the multiplier of any desired value may be setinto the machine. As each key 38 is depressed, a number corresponding tothe valu of the key depressed is indicated on the multiplier indicatordials which are visible through a window 49 provided in the casing ofthe machine. After a desired multiplier value has been set into themachine by means of the keys and a multiplicand has been set up on theamount keyboard, an automatic multiplication operation may be initiatedby depression of one of the keys ll, 42 or A3. The key 41 will cause anautomatic multiplication operation to take place in which themultiplicand will be successively multiplied by each digit of themultiplier. However, prior to the initiation of the multiplicationoperation, the carriage will be automatically shifted to its extremeleft-hand position after which the multiplication of the multiplicand byeach digit of the multiplier will take place, the carriage shifting oneplace to the right after each multiplication of the multiplicand by amultiplier digit. This operation will continue automatically until themultiplicand has been successively multiplied by each digit of themultiplier after which the product will appear in the accumulator wheels22 and the multiplier will now be indicated on the revolutions counterwheels 23. When the multiplication key 42 is depressed a similar type ofoperation will take place except that now the product will be registerednegatively in the accumulator wheels 22 instead of positively as was thecase when the muliplication operation was initiated by the key M. If itis desired that the accumulator wheels 22 and/or the revolutions counter23 be zeroized prior to the initiation of the automatic multiplicationoperation, the return and clear multiplication key 43 may be 'aeeaauutilized. Upon depression of this key the carriage will be shiited toits extreme left hand position after which the accumulator wheels 22and/or the revolutions counter wheels 23 will be reset to zero and anautomatic multiplication operation will then take place as before.

Reference may be had to Patent No. 2,371,752 issued: to Carl M. F'ridenvon March 2Q, 1945, and Patent No. 2,399,917 issued to Carl M. Friden andAnthony B. Machado. on May 7', 1946, for a complete disclosure of theautomatic multiplication mechanism.

Selecting and actuating mechanism The values to be introduced into theaccumu- Iator wheels 22 are determined by means of a selecting mechanismassociated with each bank of numeral keys 2 9. As shown in Figs. 2 and3, each bank of keys cooperates with a pair of parallel selecting bars50 and- 5lwhich are mounted for endwise movement by means of parallelsupporting links 52 and 53 and are resiliently urged toward the rear ofthe machine by means of springs 49. The lateral spacing of the selectorbars 5!} and 5 i is maintained by means of suitable slots provided incrossbars 54 and 55 which extend between the left and right side frames45 and 46 (Figs. 3 and 9-) of the machine. Each of the selector bars isprovided with a series of inclined cam faces 56 which are adaptedto beactedupon by pins 5'"! provided on the key stems of the amount keys 29.The selector bar 59 is provided with five such cam faces which cooperatewith the 15 keys, while the bar it is provided with four cam faces 55which cooperate with the 6-9- keys. Each of the selector bars isprovided at its rear end with a bent-over forked extension 58 whichembraces a groove provided in each of the hubs of a pair of selectorgears 59. These gears are slidably mounted on a longitudinally disposedsquare shaft 63 journalled in the crossbars 55, 6| and 62 of the machineframe. The gear 59 which is controlled by the selector bar 56 for the1-5 keys is adapted to cooperate with stepped teeth 63 provided on theeriphery of an actuator drum 64 while the gear 59 controlled by theselector bar 5| for the 69 keys is adapted to cooperate with teeth 65also provided on the drum '64. Thus, when the number 1 key is depressed,the gear 59 controlled by the bar 50 will be slid forward one step alongthe square shaft 60 so as to bring the gear into the path of travel ofthe longest gear tooth 63 thereby causing the shaft 60 to be given oneincrement of rotation. In a similar manner, depression of the 2, 3, 4:or 5 keys Will cause the gear to be brought into the path of travel ofsuccessive teeth 63 so as to cause the shaft 50 to receive additionalincrements of movement. Depression of the key will cause the gear 59controlled by the bar 5! to be moved forward one step so as to bringthis gear into cooperative relationship with the 6, teeth 65 of equallength, whereas depression of the *7, 8, and 9 keys will cause the gearto be, moved into the path of travel of additional teeth 65. which aredisposed in staggered relationship on the drum 64.

The actuator drum 6,4 is secured to. an actuator shaft III which isjournalled at its forward end. in cross-bar 55 and at its rearward endin. crossbar H of the machine framework. This shaft is provided at itsforward end with abevel gear 12 which meshes with a corresponding bevelgear 13 secured on a cross-shaft M journalled in. the machine sideframes 45 and 46 and adapted. to be given cycles of rotation by means ofan electric motor which is provided for driving the operating mechanismof the machine. Also mounted on the actuator shaft 10 is a secondactuator drum 15 which is. provided with two sets of teeth correspondingto teeth 63. and 65 which are arranged to cooperate with the selectorgears controlled by an adjacent order of amount keys.

Slidably and non-rotatably mounted on the rear end of the square shaft6.0 is a spool carrying an add gear 81 and a subtract. gear 82. As shownin Fig. 2., these gears are normally lo.- cated in a, neutral position.with respect to. a gear 8.3 secured to the: lower end of an accumulatorwheel dial shaft 84: journalled in a hollow carriage. frame bar 85.These gears 8| and 82 may be selectively engaged with the gear 33 bymeans of a strap or gate 86- extending transversely of the square shafts6n andsupported on either side of the machine by a pair of identical.arms 81 secured to a shaft 88 journalled between the side frames 45 and46. The shaft 88 and the gate 86 ar normally held in the position shownin Fig. 2 by means of a conventional springbiased centralizer so as tonormally maintain the add-subtract gears 8| and 82 in their neutralposition and thereby permit the carriage to be shifted from One ordinalposition to another without interference on the part of the gears 8| and82. However, by means later to be described, the shaft 88 may be rockedclockwise in order to engage the gear 8'! with the gear 83 so as tocause an accumulator dial 22 secured to the upper end of the dial shaft84 to be turned in a forward or positive direction, or the shaft 88 maybe rotated counter-clockwise so as to cause the subtract gear 82 to meshwith the gear 83 and thereby cause the dial 22 to be rotated in thereverse or negative direction.

Secured to the dial shaft 84, immediately above the gear 83', is atens-transfer cam 90 which is arranged to cooperate with a transferlever 91 pivotally mounted on the bar 85. The lever 9| is provided witha bent-over car which engages between the flanges of a spool 92 which isslidtransfer gear 9.3 in the next higher order to be.

moved into the plane of the actuator disc 54 where it will be operatedby the single tooth thereon and so cause an additional increment ofmovement to be given to the next higher order accumulator dial.

The revolutions counter dials 23 are mounted on a series of horizontaldial shafts I00 which ar journalled at their forward ends in a carriageframe bar ill! and at their rear ends in. the bar 85. Also secured toeach dial shaft [00' is an actuator gear H32 which is arranged to bedriven by a counter actuator device 103 so as to cause the counter diallocated in the number one position to be given one step of movement foreach cycle of operation of the actuator shaft 10. This mechanism isfully shown and described in the above-mentioned Patent'No. 222.9,- 889,and reference may be had to this patent for further informationvconcerning the construction and mode of operation. of this. mechanism.

Each of the accumulator dial shafts 84 is provided with a mutilatedresetting gear I08 which is arranged to cooperate with a resetting rackI09 mounted for endwise sliding movement in the bar 85. This rack isconnected with the zero setting knob 21 (Fig. 1) so that reciprocationof the knob 2'? will cause the rack Hi9 to likewise be reciprocated andthereby cause all of the numeral wheel dials 22 to be reset to theirzero positions. The revolutions counter dials 23 may likewise be resetto zero by means of mutilated gears Ill) secured to the dial shaits Iand cooperating with a resetting rack IlI operatively connected with theresetting knob 28. Further information concerning the detailedconstruction of the resetting mechanism for the accumulator dials andrevolutions counter dials may b obtained by referring to Patent No.2,229,889 in which this mechanism is fully shown and described.

Plus and minus keys Means is provided whereby the depression of the pluskey will cause the add gear ill to be engaged with the gear on the lowerend of the dial shai't 8t and thereafter cause the driving motor of themachine to be energized and the main clutch to engaged. Referring toFig. 8 of the drawings, the plus key 38 is mounted on the upper end of akey stem IIt' which is mounted for endwise sliding movement by means ofslots IIG formed therein which engage with screws Ill mounted in acontrol plate Iit. This plate is secured to the right side frame 46 andserves as a support for the right hand control mechanisms of themachine. The key stem H carries a roller IIE which is adapted tocooperate with a cam lace I provided on a gate setting slide I2I whichis pivotaliy attached at its rear end to an arm I22 secured to the shaft83. This slide is supported at its forward end by means of an arm I23pivotally connected to the slide by means cl astud I2 1 mounted in theupper end of the arm and pivoted at its lower end on a stud I25 mountedin the control plate Ilii. Hence, when the plus key is depressed theslide Iii will be moved rearwardly and thereby cause the shalt 88 to berocked clockwise as viewed in Figv 2 and so cause the gear ill to beengaged with the gear Also mounted on the key stein H5 is a stud #25adapted to cooperate with an inclined slot I2? provided in a motorcontrol slide I28 which is mounted for sliding movement on the screw Illand on a similar screw I'Za. Lying against the rear end or the slide I28is a pin iSI (see also Fig. 9) v is mounted in the upper end of a clutchcontrol lever i552 pivotally supported on a screw I33 which is securedto the right side frame 46. The lower end ol' the lever I32 cooperateswith a clutch dog I24 and normally holds the dog out of engagement witha driving ratchet (not shown) which is operatively connected to the gearI35 which is secured to a sleeve I36 (Fig. 8) journalled on the shaft14. Meshing with the gear I35 is an idler gear I31 which is arranged tobe driven by a spur gear I38 mounted on the end of the motor shaft I39.

Pivotally secured to the pin I3I is a link I49 which is pivoted at itsopposite end on a stud hII mounted in the upper end of a lever I42 whichis pivotally supported on a screw I43. The 10*- er end of the lever I42is bifurcated and engages with a pin HM provided on the upper end of alever I45: pivotally supported on a screw I46. The lower end of thelever I45 carries an insulated roller I4? which is adapted to engagewith one leaf or" a leaf spring contact Hi8. Hence, when the stud I3I ismoved rearwardly against the action of a spring I49 connected to theforward end 01' the link Hill, the contacts I433 are closed and thedriving motor is energized. This causes the gears I38, I3? and I to berotated thereby causing the driving ratchet of the clutch to be revolvedand, upon engagement oi; the dog I34 therewith, to cause the shaft It towhich the dog is secured to be rotated and thereby cause operation ofthe actuator shaits ill. The square shafts will hence be rotated to anextent depending upon the setting of the selecto gears 59 and motion ofthis shaft will be transmitted to the accumulator dials 22 by means or"the gears 8| and 83.

In a similar manner, depression of the minus key 3| will cause thesubtract gears 52 to be engaged with the gears 83 mounted on the lowerends of the dial shafts 5 and so can the amount set up on the numeralkeys 2?; to be subtracted from the setting oi the accumulator dials 22.The key stem of the minus 3i is mounted for endwise sliding movement bymeans of elongated slots I54 therein which engage with the screw I29 anda similar screw Iii The key stem I38 is provided with a roller which isadapted to cooperate with a cam face I51 provided on the gate settingslide Iz'il. Therefore, depression of the minus key ill will cause theslide I2I to be moved forwardly and so cause counter-clockwise rotationof the shaft 853, as viewed in Fig. 2, so as to cause the subtract gearse2 to be engaged with the gears The key stein also carries a stud whichcooperates with an inclined slot I59 provided in the motor control slideI28 so as to cause the motor to be energized and the clutch to beengaged when the minus key is depressed.

Key release mechanism Referring now to 4 it will be observed that thekey stems 01 each oi the numeral keys and the ordinal clear 22 areprovided with elongated slots ill} through which are passed transversethroughrods Ill which are supported in the keyboard framework. Thenumeral keys from 1-9 in each bank are normally maintained in. theirraised positions means 0i a coil spring I'l'ii which is secured ateither end to the 1 out and back end plates H3 and Il l respectively(Fig. 3) of the keyboard framework. The ordinal clear keys 32 areresiliently maintained in their raised positions by means or compressionsprings which lie within apertures provided in the plate it and arecompressed between the bottom of the aperture and a lug l'l l providedon the stem of each or the keys Each of the numeral keys provided withan inclined cam face l'l'I which cooperates with a latching slide iiilso that when the key is depressed this slide will be moved rearwardlyagainst the force of a con'lpression spring I'iQ (Fig. 3) until the keyis fully depressed, whereupon the slide will move forward intoengagement with a notch I39 provided in the stem of each of the keys 2tthereby rnaii'itaining the keys in their depressed positions. Any of thenumeral keys from 1-9 in each bank may be released by means of theordinal clear key 32 for that bank. The key stem of each ordinal clearkey is provided with an inclined cam face iii! which will cause thelatching slide ill} to be moved rearwardly when this key is depressed toan extent sufficient to free any of the depressed numeral keys and allowthem to be raised into their normal positions by means of the springI12. Alternatively, any depressed numeral key may be released by thedepression of another numeral key in the same bank. This release of onekey by the depression of another in the same bank is made possible by aslight inclination of the key stem between the camming face Ill and thenotch I30 which tends to provide a slight overthrow of the latchingslide I'IB so as to disen gage the slide from the notch I85 of apreviously depressed key.

The forward ends of the latching slides I18 are bent downwardly to formabutment faces I82 which are adapted to be engaged by a common keyrelease bail I83 extending across the front of the machine between theside frames 45 and 46. This bail is pivotally mounted on a rod I84supported at either end in the side frames. As shown in Fig. 9, the keyrelease bail I83 is provided with a laterally extending projection I85which passes through an aperture 185 provided in the right side frame46. The bail 183 is adapted to be operated toward the end of eachmachine cycle by means of a finger l'8'I provided on the forward end ofa link I38 pivotally supported on a stud I38 secured to a lever I90pivoted at ISI on the right side frame. The link I88 and the lever I95are urged toward the front of the machine by means of a spring I82ten'sioned between a stud on the link I88 and a stud mounted on theright side frame. The lever Ills is provided with an extension I93 whichis adapted to engage with a limit stop I94 mounted in the right sideframe so as to limit the movement of the link I88 and the lever I tilunder the influence of the spring I92.

The lever I90 is provided at its lower end with a pin I95 extendingthrough an aperture I96 provided in the right side frame. In order tocause the lever I39 to be operated near the end of a machine cycle inorder to release any depressed amount keys 29, a cam 200 (Fig. issecured to the right hand face of a drum cam 2M secured to thetransverse shaft I4. This cam is adapted to cooperate with a nose 202provided on the lower end of a lever 203 pivotally mounted on a screw204 secured to the right side frame 4t. At its upper end the lever 203is pivotally connected at 205 with the rear end of a link 295 which isprovided at its forward end with a hook 201 for engaging with the studI95. The forward end of the link 206 is also provided with an inclinedcam face 208 which bears against a roller 209 mounted on the right sideframe. The link 206 is also provided with an. elongated slot 2H) whichcooperates with pin 2!! secured to the stem of the add key 34 see alsoFig. 9). The add key is normally he d in its raised position by means ofa spring 2I5 which is tensioned between pin 2 and a stud mounted on theright side frame. The key however, be latched down in its depressedposition by means of a notch 2H5 formed in the of the key whichcooperates with a square stud 2!! secured to the right side frame. VIhenthe add key 34 is depressed, the hook 20! eno er the pin I95 and thelever 203 is rocked clockwise by a spring 2I8 so as to move the nose 2Minto the path of the cam 293. Toward the end of the machine cycle, thecam 23!! will engage with the nose 202 to rock the lever 2G3counter-clockwise and pull the link 206 rearwarclly to thereby rock thelever I93 counter- 10 clockwise (Fig. 9) and thereby cause the link I88to rock the key release bail I83 and thus release any depressed amountkeys '29.

Key-set key-responsive mechanism In the machine, as hereinbeforedescribed, the amount to be entered into the accumulator is set up onthe keys 29 after which the plus key 30 or the minus key 3| is depressedso as to cause operation of the actuating mechanism and thereby causethe amount set on the keys to be entered positively or negatively intothe accumulator wheels 22. In the present machine, however, means isalso provided whereby the machine may be converted into a key-responsivetype of calculating machine at the will of the operator. For thispurpose a special key slide device 225 (Figs. 3 and 4) is providedbeneath the key latching slide I18 for the units order bank of amountkeys 29. As herein illustrated, this slide is in the form of a U-shapedchannel and is supported beneath the keys by means of a pair of parallellinks 226 which are pivotally secured at their lower ends to the slide225 and at their upper ends to a longitudinally extending keyboard frameplate. The slide 225 is urged toward the front of the machine by meansof a spring 224 and is provided with rectangular slots 22'! throughwhich the lower ends of the stems of the keys 29 extend so that when oneof the keys 29 is depressed, the inclined cam face Il'I thereon willengage with a lip 228 formed at the rear edge of each of the slots 22'!and thereby cause the slide 225 to be moved toward the rear of themachine against the urgency of its spring 224. In a similar manner theinclined cam face I8I on the ordinal clear ke 32 for the units orderwill ongage with the rear end of a slot 229 provided in the forward endof the slide 225 so as to cause rearward movement of the slide.

Near its forward end the slide 225 is provided with a downwardlyextending finger 230 which engages with a formed-over ear 23I (see Figs.3, 5, and 6) provided on the upper end of an interponent 232 which ispivotally mounted on a frame stud 233 by means of an elongated slot 234provided therein. The interponent 232 is normally urged upwardly bymeans of a spring 235 and at the same time is urged to rotate in aclockwise direction about the stud 233 so as to bring the forward edgeof the interponent into engagement with the edge of the cross-bar 54. Atits lower end the interponent carries a stud 23'! which lies within aU-shaped recess provided in an intermediate latch 238 which is pivotallymounted on the stud 233 and urged clockwise by means of a spring 239.The lower edge of the intermediate latch 238 engages with a shoulder 2Mformed on the forward end of a primary latch or pawl 24I pivotallymounted on a screw 242 which is secured to the right side frame 46. Thelatch I is urged to rotate in a clockwise direction about screw 242 bymeans of a spring 243 so as to cause an inclined face 24%. provided onthe latch nose to bear against a projection 01- stud 245 secured to anauxiliary power slide 245. The slide 245 is mounted for longitudinalsliding movement on the side frame of the machine by means of a pair ofelongated slots 241 which cooperate with the stud 233 and second stud248. The slide is urged rearwardly by means of a relatively strongspring 2413 so as to cause the primary latch 24! to be rockedcounterclockwise when the latch 238 is released. Thus, when the latch24l is held by the latch 238, the stud 245 and inclined face 244restrain the slide 246 against the urge of the spring 249; but the stud245 and inclined face 244 cooperate with the spring 249 to bias thelatch device 24! to move to a non-restraining position with respect tothe slide 245 when the latch device is released. An operating hookprojection 250 is secured to the slide 246 by means of screws 25! withprovision being made for adjusting the hook backward or forward relativeto the slide 246.

As shown more clearly in Fig. 8, the hook 259 is adapted to cooperatewith a stud projection 255 mounted in the forward supporting arm 123 forthe gate setting slide IZI, sufiioient clearance being provided betweenthe hook 25:! and the stud 255 when the parts are in their normalpositions as to enable the gate setting slide l2i to be moved forwardlyto its subtracting position without interference on the part of the hook258 and the stud The stud 255 also lies in front of an operating arm25%: for the motor control slide I28. The arm 256 is loosely pivoted onthe stud I25 at its lower end and is provided with a bifurcation itsupper end which engages over a stud 257 secured to the slide I23. Whenthe parts are in their normal positions as shown in Fig. 8, a clearanceis provided between stud 255 and the forward edge of the arm so thatwhen the power slide 245 is released and moved rearwardly by means ofits spring 249 the hook 256 will first engage the stud 2*? and initiaterearward movement of the gate setting slide IN and, after a briefinterval, will pick up the arm 255 and cause rearward movement of themotor control slide 123. Hence, the add Bl (Fig. 2) will be engaged withthe gears 83 on the lower ends of the dial shafts 84 after which themotor will be energized and the clutch engaged so as to cause operationof the actuating mechanism. Thus, when an amount key 29 in the unitsorder or the ordinal clear key 53-2 thereof is depressed, the specialkey slide 225 Will be cammed rearwardly thus causing the interponent 232to be rocked counter-clockwise against the tension of its spring 235.This will cause the stud 23? on the interponent to lll0V8 forwardly andthus rock the intermediate latch 233 out of engagement with the shoulder2 .0 on the primary latch 24I thereby freeing the primary latch 24! tobe rocked counterclockwise by pressure exerted by the spring 249 throughthe stud 245 of the slide 255 on the inclined face 2% of the latch 24!.Such rocking of the latch 24! will free the power slide 246 for movementunder the influence of its spring 249. As the slide its movesrearwardly, the stud 245 will rock the latch 2M counter-clockwiseagainst the influence of its spring 243 as the stud rides up theinclined. face When the power slide 246 comes to rest in its rearward oroperated position, the pin 245 will rest against a flat surface 253provided on the latch 2M behind the inclined face 24 3.

On the rear end or the slide 246 is provided a stud 259 which bearsagainst the forward of the lever 293 so that as the slide moves rear"wardly the lever will be rocked clockwise about its pivot 2M therebycause the nose 262 on the lever to be moved into the path of the cam209. Hence, when the machine is cycled, the cam will engage the nose 2S2force the slide 246 forward thereby permitting the latch 2-H to berocked clockwise by its spring 243 and there by permit the latch 238 toagain engage the shoulder and thus retain the slide 245 in its forwardposition.

to prevent repeated operations of the i in the event Lat a 148 in theunits heid depressed, the power slide is provided on its for rd end withan inclined camnung surface 5253 which is adapted to engage the pin21?"; on the interponent and force the same downward. against thetension of its spring thereby dengaging the ear 2%! from the "er Thiswill permit the interponent to be rocked clockwise by spring 2355 untilthe forward edge thereof engages with the crossbar 54 so that the ear 25i will now lie beneath the point of the finger 2239. The intermediatelatch 236 will now be free to engage the shoulder 246 on the primarylatch when the power slide is restored at the conclusion of the machinecycle.

In order to transform the machine from a key- 1 sponsive type to akey-set type, manually settable means comprising a finger button (Fig.l) is provided at the front of the machine, this button having a shank252 Fig. 2) which projects through a siot provided in the casing 26 ofthe machine. The inner end of the shank 2%? is secured to a keeper plate265 located beneath the casing the keeper plate being provided with aformedover car he engaging with an inclined cam face 25l provided on theupper end of a strap 2613. This strap is provided with of formed-overears provided with which "tge over the rod i'tt which to support he keyrelease bail I83. The is provided with a rearwardly extendportion Billwhich lies over an car 271 formed on the interponent 232. In case theoperator wishes ta render the units order live key mechanisminoperative, the finger button 2M may be moved to the right (Fig. 1)thereby causing the strap 26%; to be rocked counterclockwise (Fig. 5) soas, to force the interponent 232 downwardly out of engagement with thefinger 2353 on the special hey slide Hence, although the slide will beoperated as previously described, each time that a iii? in the unitsorder is depressed the interponent will not be rocked thereby and hencethe power slide 266 will remain inactive. When the finger button it! isagain moved to the left (Fig. l) the intcrponent will be released by theextension Bill on the strap so that car 223i on the interponent willagain lie behind the ringer 23% as shown in Fig. 6 thereby rendering thelive mechanism for the units order operative to set the add-subtractgate and initiate a machine cycle whenever a key in the units orderdepressed.

Since the lkey mechanism hereinbefcre described will ordinarily be usedin adding opera tions, provision has made for causing the add key 34 tobe automatically latched down at the end or the first cycle ofkey-responsive operation. For this purpose the link is provided at itsforward end with an arcuate 215 so that when the link is moved.forwardly by the power slide 2 35, the forward end of the linl: will bemoved downwardly result of the cocperation of the surface 21?. with theroller This downward movementis suffici it to enable the notch in theadd key to be c.1- gaged with the square stud 2!? (Fig. 9) by the spring255 5). Thus hook on the link 2% will be engaged with the pin and whenthe link is again moved toward r of the machine by engagement of theearn 20*) with the nose 202, the key release bail I83 will be operatedto move the key latching slide I18 rearwardly and permit any depressedamount keys to be returned to their raised positions by means of theirsprings I12. The add key 34 will remain latched down so as to cause keyrelease at the end of each machine cycle until the key is manuallyreleased by the operator.

In order to enable the present mechanism to be advantageously used inthe case of numbers ending in a series of zeros, provision has been madefor connecting each of the ordinal clear keys 32 (Fig. 1) with therelease mechanism for the power slide 246. As shown in Figs. 3 and 4, alaterally extending bail 216 is provided beneath the forward edge of theamount keyboard, this bail being provided at either end with formedoverears 2?! by means of which the bail is pivoted on a rod 278 secured ateither end to the right and left side frames of the machine. The bail2'16 is provided along its upper edge with a formed-over portion 219which is adapted to cooperate with the lower ends of the key stems ofthe ordinal clear keys 32. Hence, whenever one of these keys isdepressed, the bail will be rocked clockwise about the rod 218 andthereby cause a finger 289 struck off from the bail to press rearwardlyagainst a lug 28I provided on the forward end of the special key slide225. As hereinbefore described, rearward movement of the slide 225 willcause the finger 239 to rock the interponent 232 and thereby release thepower slide 245 for rearward movement under the influence of its spring249. As shown in Fig. 1,

each of the ordinal clear keys 32 is provided with a somewhat elongatedkey cap in order to facilitate the depression of these keys by theoperator of the machine when entering a number ending in a series ofzeros.

Operation While it is believed that an understanding of the mode ofoperation of the present mechanism may be gathered from the foregoingdescription, a brief summary thereof will now be given in order toafford a more thorough understanding of this invention.

When it is desired to use the machine in adding up a list of figures,the finger button 26I is moved to the left as viewed in Fig. 1 so as toenable the ear 23l on the interponent to lie be hind the finger 230 asshown in Fig. 6. The first figure of the series to be added is now setup on the amount keys 29 and if the last digit of the figure is a numberfrom 1 to 9 the depression of the corresponding key in the units orderwill cause the special key slide 225 to be moved toward the rear of themachine thereby rocking the interponent 232 and releasing theintermediate latch 238 (Fig. 6) so as to free the primary latch MI andpermit the power slide 246 to be moved rearwardly by its spring 249(Fig. 7). If the last digit of the amount to be added is a zero, or ifthe amount ends in a series of zeros, the operator may depress any oneof the ordinal clear keys 32 to the right of the last significant digitthereby causing the bail 2'16 (Fig. 4) to be rocked clockwise and socause the slide 225 to be moved rearwardly thereby releasing the latch238 and the power slide 246 as before. ward travel of the slide 246, thehook 250 thereon will pick up the stud 255 (Fig. 8) and cause the gatesetting slide I2! to be moved rearwardly so as to engage the add gearsBI with the gears 83 on the lower ends of the dial shafts 84.

During the rear- 14 Following the engagement of the ears 8| with thegears 83, the motor switch I48 (Fig. 9) will be closed and the clutchcontrol lever I32 will be disengaged from the clutch dog I34 so as toinitiate a cycle of operation of the actuating mechanism of the machine.The closure of the switch and engagement of the clutch results from therearward movement of the motor control slide I28 due to engagement ofthe stud 255 with the arm 256. At the same time, the stud 259 on therear end of the power slide 246 (Fig. 5) will cause the lever 203 to berocked clockwise thereby moving the nose 232 into the path of the cam2410 and also causing the hook 291 to be moved over the stud I95 and theadd key 34 to be latched down. During cycling of the machine, the cam260 will engage the nose 202 so as to restore the power slide 246 andpermit the shoulder 24F (Fig. 6) on the primary latch 24I to bere-engaged by the intermediate latch 23.8. The link 295 will also bedrawn rearwardly so as to cause operation of the key release bail I83(Figs. 5 and 9). As hereinbefore described, the power slide 246 will berelatched in its home position even though one of the amount keys in theunits order, or one of the ordinal clear keys 32, is held depressed byreason of the cooperation of the inclined cam face 260 on the forwardend of the power slide 246 with the stud 231 secured to the interponent232 which will cause the connection between the finger 23d and the ear23I to be broken during the rearward travel of the power slide. When thepower slide 2% is restored to its home position, the stud 255 (Fig. 8)will be released by the hook 25d so as to enable the add-subtract gearsBI and 52 (Fig. 2) to be returned to their neutral position, as shown inFig. 2, by means of the conventional centralizing springs for theadd-subtract gate 86. Similarly, when the arm 256 is released by thestud 255, the motor circuit will be broken and the clutch disengaged byspring 149 (Fig. 9) thereby terminating a cycle of operation of thecalculating machine. The next number of the series to be added is nowset up on the amount keyboard in the previously described manner, themachine again being cycled upon depression of a key 29 in the unitsorder or by depression of one of the ordinal clear keys 32. After thelast number of the series has been added into the accumulator wheels 22,the machine may be restored to normal-so as to enable multiplying ordividing operations to be performed thereon in the conventionalmanner-by moving the finger button 26I to the right so as to cause theinterponent 232 (Fig. 6) to be forced downwardly thereby breaking theconnection between the finger 231i and the ear 23!. The machine will nowbe restored to its normal key-set condition and the add key 34 may bereleased by pulling forward thereon so as to remove the notch 2H5 (Fig.9) from the square stud 2I'I, whereupon the key will be elevated intoits normal position by means of the spring M5 (Fig. 7).

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is:

1. In a calculating machine cf the class described having means forgiving the machine cycles of operatic-11 and means for initiatingoperation of said cycling means; the combination of a keyboard having aplurality of orders of depressible amount keys each order of whichcomprises a plurality of keys; an amount registering means; adifferential mechanism controlled by said amount keys for causing anamount to be entered into said registering means; and means foreffecting, in a single cycle of said cycling means, entry in saidregistering means of a multi-digit value set in a plurality of orders ofsaid keyboard, comprising a slide movable from one position to anotherfor operating said initiating means; means for resiliently urging saidslide to move from said one position to said other position; a primarylatch device engageable with said slide for restraining said slideagainst movement under the influence of said urging means and beingbiased to move to a non-restraining position with respect to said slideand thus release said s dc to be moved by said urging means; anotherlatch device en 'ageable with said primary latch device for retainingthe latter in position for restraining said slide; and means including adisplaceable element common to all of the lteys of the lowest only ofsaid orders of keys and operable by any one of said keys of said lowestorder for disabling said other latch device and releasing said primarylatch device and said slide for movement so as to cause operation ofsaid initiating means.

2. In a calculating machine or the class dcsoribed having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a keyboard having aplurality of orders of depressible amount keys each order of which compises a plurality of keys; an amount registering means; a differentialmechanism controlled by said amount keys for causing an amount to beentered into said registering means; and means for effecting, in asingle cycle of said cycling means, entry in said registering means of amulti-digit value set in a plurality of orders 01' said keyboard,comprising a slide movable from a normal position to an actuatedposition for operating said initiating means; means for urging saidslide from said normal position to said actuated position; a primarylatch device for restraining said slide against movement and beingbiased to move to a non-restraining position with respect to said slideand thus release said. slide to be moved by said urging means; anotherlatch device engageable with said primary latch device for retaining thelatter in position for restra i ng said slide; a displaceable element;means on each of the keys or the lowest only of said orders of keys forcausing said element to be displace whenever a key in said lowest orderdepres and means on said element cooperable with said other latch deviceso as to cause the latter to be disabled whenever the element isdisplaced and thereby enable the bias on said primary latch device tomove it to discontinue the restraint on said slide and enable said slideto operate said initiating means.

3. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperaticn of id cycling means; the combination of keyboard having aplurality of orders of depressiblc amount keys; a register; adifferential mechanism controlled by said amount keys for causing anamount set up thereon to be entered into said register; a power operatedactuator for operating said initiating means; means for restrain saidactuator against operation including a rotatable pawl having a nose, anelement on said actuator engageable by said pawl nose when said pawl isin its normal position for restraining said actuator and tending torotate said pawl from its normal position to release said actuator foroperation, and means for latching said pawl against rotation; and meansrendered effective upon depression of any one of said amount keys forreleasing said latch means and allowing said actuator to operate saidinitiating means.

. In a calculating machine of the class dcscribed having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a member movablefrom a normal position to an actuated position for operating saidinitiating means; means for urging said member to move from said normalposition to said actuated position; a latch device for restraining saidmember against movement; a plurality of depressible amount keys; a slidedevice; means on each of said keys for causing said slide device to beoperated whenever a key is depressed; means including an interponentoperatively connecting said slide device with said latch device so astocause the latter to be disabled whenever the slide device is operated;a manually settable means for selectively disconnecting said interponentfrom one of said devices and thereby preventing the disabling of saidlatch device and. the release of said member whenever a key isdepressed; and other means for effecting operation of said cycleinitiating means when said manually settable device is set to disablesaid connecting means.

5. In a calculating machine of the class de scribed having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of spring-drivenactuator for operating said initiating means; a latch mechanism forretaining said actuator in its home position; a plurality of depressibleamount keys; a table member; means on each of said keys for causing saidmember to be shifted whenever a key is depressed; an operativeconnection between said member and said latch mechanism for causing thelatter to be released upon shifting of said member, said connectionsincluding a displaceable pivotally and slidably mounted interponent forconnecting said member with said latch mechanism; a manually settabledevice for selectively slidably displacing said interponent so as tobreak the connection between said member and said latch mechanism andthereby prevent the release of said actuator upon depression of anamount key; and other means for effecting op eration of said cycleinitiating means when said manually settable device is set to disablesaid connecting means.

6. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a spring-drivenactuator for operating said initiating means; means for retaining saidactuator in its home position, said means including a pivoted pawlhaving a nose, a projection on. said actuator engageable with said nosefor rotating said pawl when said actuator moves out of home position,and a latch for preventing rotation of said pawl; a plurality ofdepressible amount keys: a shiftable member; means on each of said keysfor causing said member to be shifted whenever a key is depressed; anoperative connection between said member and said latch for causing thelatter to be released upon shifting of said member including adisplaceable element for connecting said member with said latch; and amanually settable device for selectively displacing said element so asto break the connection between said member and said latch and therebyprevent release of the actuator upon depression of an amount key.

7. In a machine or" the class described having a main operatingmechanism, power means for giving said main operating mechanism cyclesof operation, and means for initiating operation of said power means;the combination of a member movable from a normal position to anoperated position; means for resiliently urging said member to move fromsaid normal position to said operated position; means for causing saidmember to operate said initiating means when the member moves from itsnormal position to its operated position; means driven by said mainoperating mechanism for restoring said member from its operated positionto its normal position on each cycle of operation; a latch mechanism forholding said member in its normal position against the influence of saidurging means; a plurality of depressible amount keys; an opera tiveconnection between each of said keys and said latch mechanism forcausing the latter to be released upon depression of any of said keys;and means operating in response to the move ment of said member from itsnormal position to its operated position for breaking said connection soas to enable said member to be relatched in its normal position eventhough an amount key be held depressed.

8. In a machine of the class described having a plurality of depressibleamount keys, an amount registering means, a difierentlal actuatingmechanism controlled by said amount keys for causing an amount to beentered into said registering means, power means for operating saiddifferential actuating mechanism, and means for initiating operation ofsaid power means; the combination of a power driven member movable froma normal position to an operated position for operating said initiatingmeans; cyclically operable means associated with said differentialactuating mechanism for restoring said power driven member from itsoperative position to its normal position; means for normallyrestraining said member against movement from said normal position tosaid operative position; an operative connection between each of saidkeys and said restraining means for causing the latter to be disabledupon depression of any of said keys; and means operated in response tomovement of said power driven member from its normal position to itsoperative position for breaking said operative connection so as toenable said restraining means to again become efi-ective to restrainsaid power driven member when it is restored to its normal position eventhough an amount .key be held depressed.

9. In a machine of the class described having a main operatingmechanism, power means for giving said main operating mechanism cyclesof operation, and means for initiating operation of said power means;the combination of a slide movable from a normal position to an operatedposition; means for resiliently urging said slide to move from saidnormal position to said operated position; means for causing said slideto operate said initiating means when the slide moves from its normalposition to its operated position; a latch device for holding said slidein its normal position against the influence of said urging means; aplurality or depressible amount keys; a control member connected witheach of said keys and also with said latch device for causing saiddevice to be released when one of said keys is depressed; means drivenby said main operating mechanism for restoring said slide to its normalposition on each cycle of operation; and means on said slide for causingthe connection between said control member and said latch device to bebroken when said slide moves from its normal position to its operatedposition so as to enable said slide to be relatched when restored bysaid main operating mechanism so as to prevent repeated cycling of themachine in case an amount key is held depressed.

10 In a machine of the class described having a main operatingmechanism, power means for giving said main operating mechanism cyclesof operation, and means for initiating operation of said power means;the combination of a springdriven actuator for operating said initiatingmeans; cyclically operable means associated with said main operatingmechanism for returning said actuator to its home position; a latchingmeans for retaining said actuator in its home position; a plurality ofdepressible amount keys; a member common to all of said keys and adaptedto be shifted when any one of them is depressed; an operative connectionbetween said member and said latching means for causing the latter to bereleased upon shifting of said member including a displaceable elementfor connecting said member with said latching means; and means operatingin response to the movement of said actuator when the same is releasedby said latching means for displacing said element so as to break theconnection between said member and said latching means and therebyenable the actuator to be relatched when returned to its home positioneven though an amount key be held depressed.

11. In a machine of the class described having a main operatingmechanism, power means for giving said main operating mechanism cyclesof operation, and means for initiating operation of said power means;the combination of a spring-driven actuator for operating saidinitiating means; cyclically operable means associated with said mainoperating mechanism for returning said actuator to its home position;means for retaining said actuator in its home position, said meansincluding a pivoted pawl, a projection on said actuator for rotatingsaid pawl when said actuator moves out of home position, and a latch forpreventing rotation of said pawl; a plurality of depressible amountkeys; a member common to all of said keys and adapted to be shifted whenany one of them is depressed; an operative connection between saidmember and said latch for causing the latter to be released uponshifting of said member including a displaceable element for connectingsaid member with said latch; and means operating in response to themovement of said actuator when the same is released for displacing saidelement so as to break the connection between said member and said latchand cause the actuator to be retained when returned to its home positioneven though an amount key be held depressed.

12. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a keyboard having aplurality of orders of depresslble amount keys including a units order;a non-denominational key in each of said orders; a

register; a difierentiai mechanism controlled by said amount keys forcausing an amount set up thereon to be entered into said register; anormally idle power-operated device for operating said initiating means;a displaceable member common to all of the keys in said units order;means on each of the keys in said units order for causing said member tobe displaced whenever a key in that order is depressed; means controlledby each oi said non-denominational keys for causing said member to bedisplaced; and means for causing said power operated device to beoperated whenever said member is displaced to thereby cause a machinecycle.

13. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combina tion of a keyboard having aplurality of orders of depressibie amount keys including a units order;a non-denominational key in each of said orders; a register; adifierential mechanism controlled by said amount keys for causing anamount set up thereon to be entered into said register; a member movablefrom a normal position to an operated position; means for resilient- 1yurging said member to move from said normal position to said operatedposition; means for causing said member to operate said initiating meanswhen said member moves from its normal position to its operatedposition; a latch device for holding said member in its normal positionagainst the influence of said urging means; a displaceable elementcommon to all of the keys in said units order; means on each of the keysin said units order for causing said element to be displaced whenever akey in that order is depressed; connections between saidnon-denominational keys and said element for causing said element to bedisplaced whenever one of the latter keys is depressed; and a connectionbetween said element and said latch device for causing said device to bereleased whenever said element is displaced to thereby enable saidmember to operate said initiating means and cause cycling of themachine.

14. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a keyboard having aplurality of orders of depressible amount keys including a units order;means for retaining the keys in their depressed position; anon-denominational key in each of said orders cooperating with saidretaining means for releasing any depressed key in that order; aregister; a differential mechanism controlled by said amount keys forcausing an amount set up thereon to be entered into said register; anormally idle, power-operated device for operating said initiatingmeans; a displaceable member common to all of the keys in said unitsorder; means on each of the keys in said units order for causing saidmember to be displaced whenever a key in that order is depressed;connections between said non-denominational keys and said member forcausing the latter to be displaced whenever one of the latter keys isdepressed; a latch device for preventing operation of said poweroperated device, a connection between said member and said latch devicefor causing the latter to be disabled whenever themember is displaced bythe depression of a units order key or a non-denominational key so as toenable said power-operated device to operate said initiating means andcause cycling of the machine; and a manipulative member for breakingsaid connection so as to prevent disabling of said latch whenever aunits order key or a non-denominational key is depressed.

15. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a plurality ofdepressibie amount keys; means for retaining said keys in theirdepressed positions; a normally idle power device for operating saidinitiating means; means controlled by said amount keys for causing saidpower device to operate said initiating means; normally ineffectivemeans for disabling said key retaining means near the end of eachmachine cycle; and means operated by said power device for renderingsaid last-recited means effective to disable said retaining means forthe amount keys.

16. In a machine of the class described having a main operatingmechanism, power means for giving said mechanism cycles of operation,and means for initiating operation of said power means; the combinationof a plurality of depressible amount keys; means for retaining said keysin their depressed positions; a power operated member movable from anormal position to an operative position for operating said initiatingmeans; means for normally restraining said member against movement fromsaid normal position to said operative position; means controlled bysaid amount keys for disabling said restraining means so as to allowsaid power driven member to operate said initiating means; normallyinoperative means driven by said main operating mechanism for disablingsaid key retaining means during the latter part of each cycle; and meanson said power driven member for conditioning said normally inoperativemeans for operation as said member moves from its normal position to itsoperative position to thereby cause said retaining means to be disabledand said keys to be released during the latter part of the cycle.

17. In a machine of the class described having a main operatingmechanism, power means for driving said main operating mechanism, andmeans for initiating operation of said power means; the combination of aplurality of depressible amount keys; means for retaining said keys intheir depressed positions; a normally idle power device for operatingsaid initiating means; a latch device for restraining said power deviceagainst operation, means controlled by said amount keys for releasingsaid device and permitting said power device to operate said initiatingmeans; normally inoperative means for disabling said key retaining meansnear the end of each machine cycle; means operated by said power devicefor conditioning said last-mew tioned means for operation; and meansdriven by said main operating mechanism for operating said disablingmeans and for simultaneously restoring said power device to its latchedposition.

18. In a calculating machine of the class described having means forgiving the machine cycles of operation and means for initiatingoperation of said cycling means; the combination of a plurality ofdepressible amount keys; means for retaining said keys in theirdepressed positions; a normally idle power device for operating meansfor disabling said key retaining means near the end of each machinecycle, said means having an inactive position and an active position; amanipulative latch member for enabling said disabling means to bemanually moved to its active position and held there; means operated bysaid power device for moving said disabling means to its active positionwhere it will be held by said latch member; and means driven by saidmain operating means for operating said disabling means when the latteris in its active position to thereby efiect release of the amount keysnear the end of the machine cycle.

19. In a machine of the class described having a register, a pluralityof amount entering devices into which a numerical value may be set, adifferential actuating mechanism controlled by said amount enteringdevices for eifecting entry into said register of a value set into saiddevices, a sign determining device settable to either of two positionsfor determining whether the value shall be entered additively orsubtractively into said register, and power means for operating saiddifferential actuating mechanism; the combination of means forinitiating operation of said power means; a manipulative member forsetting said sign determining device to one of said positions and foroperating said initiating means in a predetermined sequence; a powerdevice for setting said sign determining device to one 01 said positionsand for operating said initiating means in a predetermined sequence;means for normally restraining said power device from operation; amechanical linkage for operatively connecting said amount enteringdevices with said restraining means so as to cause said la ter means tobe disabled when a value is set into said devices and thereby enablesaid power device to set said sign determining device and operate saidinitiating means; and selectively operable means for disabling saidlinkage so as to prevent said restraining means from being disabled whena value is set into said amount entering devices thereby placing theoperation of said initiating means and said sign determining devicesolely under the control of said manipulative member.

20. In a calculating machine of the class described having a register, aplurality of amount entering devices into which a numerical value may beset, a difierential actuating mechanism controlled by said amountentering devices for effecting entry into said register of a value setinto said devices, a sign determining mechanism adjustable from aneutral position to either an add or a subtract position for controllingthe sign of the entry into said register, power means for operating saiddiiferential actuating mechanism, and means for initiating operation ofsaid power means; the combination of a power oper-- ated member movablefrom a normal position to an operated position; a projection on saidsign determining mechanism; a projection on said power operated memberadapted to pick-up the projection on said sign determining mechanism asthe member moves from its normal position to its operated position andadjust said mechanism to its add position, there being suflicientclearance provided between said projections when the sign determiningmechanism is in its neutral position and the power operated member is inits normal position to permit said sign determining mechanism to beadjusted to its subtract position without any interference from theprojection on said power operated member; and means cooperating with theprojection on said power operated member for operating said initiatingmeans after said sign determining mechanism has been adjusted to its addposition.

36 GEORGE W. HOPKINS.

DONALD L. ROLPH.

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